Improvement in drill-grinders



A. K. RIDER. Drill Grinder.

No. 201,449. Patented March 19,1878.

INVENTOR N-PHERS, FHOfO-LITHDGRAFHER. WASHINGTON. D. C.

UNITED STATES PATENT OFFICE.

ALEXANDER K. RIDER, OF WALDEN, NEW YORK.

IMPROVEMENT IN DRILL-GRINDERS.

Specification forming part of Letters Patent No. 201,449, dated March19, 1878; application filed 7 December 13, 1877.

To all whom it may concern:

Be it known that I, ALEXANDER K. RIDER, of Walden, in the county ofOrange andState of New York, have invented certain new and usefulImprovements in Devices for Sharpening Drills, and I do hereby declarethe following to be a full, clear, and exact description of the'invention, such as will enable others skilled in the art to whichitpertains to make and use it, reference being had to the accompanyingdrawings, whichform part of this specificasimple, cheap, and efiicientmeans for grinding or sharpening twist or other drills, whereby theoperation can be performed with the greatest facility and accuracy, andalways insure the most perfect form of cutting-edge,

without the employment of skilled and costly labor for such purpose; andto that end my invention consists, first, in a device for grinding andsharpening drills, a stock for supporting the drill, consisting,preferably, of a per- 1 forated grinding-gage provided with a groovedshank angularly disposed in relation to said perforated grinding-gage,and means for holding the drill within the groove formed in the shank,whereby the body of the drill may be firmly secured to the shank, andthe cutting end of the drill caused to extend any desired length throughthe gage of the stock, and thus allow of the ready and accurate grindingof the drill.

. My inventionfurther consists in a device for grinding and sharpeningtwist or other dI'lllS, consisting of a perforated grindinggage providedwith a grooved shank angularly disposed in relation to said perforatedgrinding-gage, and means for securing a drill Within said shank, in sucha manner that the drill shall be prevented from any lateral movement,while it will admit of a predetermined axial movement, in order that theedges :1 or lips of the drill may be ground in an equal degree, andalways at the same relativeangle to each other.

My invention further consists in a. device for grinding and sharpeningtwist or other drills, a perforatedgrinding-gage provided witha groovedshank angular-1y disposed to said perforated gage, a clamp for securingthe drill firmly Within the grooved shank, and a collet adapted to beremovably secured to the drill, and also to the shank, whereby the drillmay be adjustably secured within said collet, and the latter adjustablylocked to the shank. My invention further consists in certaindetails ofconstruction and combinations of parts, as will more fully appear fromthe following description and claims.

In the accompanying drawings, Figure 1 is a plan view of my improvement.Fig. 2 is a side elevation of the same. Fig. 3 is a vertical sectionthrough the stock, drill, clamp, and collet. Fig. 4 is a detached viewof the stock. Fig. 5 is an enlarged view of the collet, and Fig. 6 is adetached view of the clamp. A represents the stock, formed of thegrinding-gage B and a shank, O, which parts may be cast or forged solidin one piece, or may be made separate and secured to each other at theirpoints of juncture, either in a rigid or in an adjustable manner. Theshank O is provided with a groove, D, preferably of V shape incross-section, which extends throughout its length, and merges into thediamond or other shaped opening E, formed in the gage B. Opening Eextends completely through said gage B, and is gradually contracted insize from the upper to the lower surface of the gage.

The V-shaped groove formed in the shank and the diamond-shaped openingin the gage together constitute a continuous V shaped groove forsupporting different-sized drills, and the number of different-sizeddrills that can'be accommodated by a single device will depend on thecapacity of said groove. Shank 0, about midway its length, is providedwith a through slot or opening, F, within which is placed the head of aclamp, G, while its screwthreaded shank or stem 9 projects through orbeyond the lower surface of the shank, to allow of the attachment of asuitable washer, a, and nut b.

Clamp G consists of aperforated head, 0, upon the upper portion of whichis formed an elongated bearing-surface, d, which is ofs'ufficient'length to overlap one of the spiralcuts or grooves of thedrill to be ground or sharpened, and thus operate to secure the drillfirmly in place, and prevent any tendency of the drill to revolve. Theeye 6 of clamp G is of sufficient size to admit the largest-sized drill,and it is obvious that the smaller-sized drills can be firmly secured bythe single stance it is shown as being made of a single; piece, andsplit on one side through ears orlugsh, each of which has an opening, h,for the reception of a thumb-screw, I. As the drill requires to be heldfirmly against axial movement, in order that the cuttinglips may beground or sharpened in an accurate manner, a collet is provided for eachsize of When the screw I is outwardly turned,

drill. the ears h separate sufficiently to allow of the adjustment ofthe drill within the collet, and by tightening said thumb-screw thedrill is-securely held in place. Gollet H is provided with tworectangular projections, i, formed on one end thereof, and locateddiametrically op-' .posite each other.

- The end of the shank is provided with a corresponding, recess, j,within which one of said projections i of the collet is received whenthe device is to be used. The collet serves to admit of the reversal ofthe drill just one-half of a circle or revolution, and

prevent the axial movement of the .drill, in

order that the opposite lips or cutting-edges of a drill may besubjected to the same grinding action, and the same angle of each lip orcutting-edge always be secured. It will .be

observed that the collet is adapted and .ar-

' ranged to have a movement at right angles to the shank, in order thatdifferent-sized drills may be firmly seated within the groove; but'theendwise or axial movement of the drill, when the latter is beingsharpened or ground, is effectually prevented by said collet. and clamp.

The operation of my improved device is as follows: The drill to beground or sharpened is inserted in the V-shaped groove and through theeye of the clamp, the cutting end caused to project the desired distancebelow the lower surface of the gage B. The cutting angle of the enteringedge is made more or less acute, according to the relative radi lposition of "the surfaces which meet to form the cutting edge or lip ofthe drill to the plane 7 of gage B. Should the end of the edge or lipcoincide with. the bottom of the groove-r-that is to say, should the lipbe centrally disposed within the V-shaped groovee-a cutting-edge ofninety degrees would be formed; and if placed at right angles to thisplane, it would result in securing the most acute cutting angle thedevice is capable of producing. 'It is therefore easy to. impart'anydesired. angle to the cutting-edges, as this matter depends solelyon'the relative radial position of the edge of the drill to the plane ofthe gage. The amount to be ground off, and the angle of cutting-edgebeing determined, the drill is securely fastened in its proper positionby means of the clamp,the nut of which is turned.

down snugly against the washer or surface of the shank. 'The collet isthen slid over the drill, and one of its projections entered into therectangular recess in the end of the shank,

when the thumb-screw is turned down, and the collet thus firmly securedto the drill, preventing an axial movement of the same. The gage B isthen applied to an ordinary grind stone, and the projecting end of thedrill is ground off on a plane with the under surface of said gage. Theclamp is now released suf- .ficiently to allow the collet and drill tobe withdrawn, to release the projection from the recess in the shank,when the collet is given a half-revolution, and the opposite projectionis entered into said recess. The clamp is then secured in place, and theopposite side of the drill is then ground oil to a plane-with gage B.This operation causes the cuttingedges of the drillto be ground toidentically the same form, angle, and length, and gives the advantageof-a straight entering edge, which causes the drill to enter easily,particularly at its center or neutral axis.

It is evident that slight changes in construction and arrangement ofparts may be adopted without departing from the spirit of myinvention-as, for instance, the stock may be constructed of two parts,and the same be hinged together, whereby the relative angle formed bythe shank and gage could be varied, as desired. The shank might beformed of a tube, or of side bars with the outer end provided with ahead having a V-shaped groove.

Again, instead of using a clamp of the construction shown and described,a latch might be hinged or pivoted to the upper face of the shank, andoperate to hold the drill in place; or the thumb-screw may be placedabove and at one side of the drill, which is the preferred arrangementwhen it is required to grind or sharpen very small drills.

The collet may be of angular form, and fit within a correspondingangular recess in the end of the shank; or projections may be formed onthe shank, and recess for their reception be made in the collet.

If it is desired to grindor sharpen ordinary drills, the collet may bedispensed with, and

.the shank is lengthened out to afford the necessary support for the endof the drill.

The device may also be used torgrind-up end drills, in which'case theshank is set. at

. nearly right angles, with the face.

I do not limit myself to the exact construc tion shown and described, asthe form of any of the several-parts may be modified to a certain extentwithout impairing the utility of the device, the general constructionand operation of the device being substantially as above described.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a device for grinding and sharpening drills, a stock for holdingthe drills, said stock consisting of a perforated grinding-gage providedwith a grooved shank angularly disposed relatively to said perforatedgage, and suitable means for holding the drill within said groovedshank, substantially as set forth.

2. In a device for grinding and sharpening drills, a stock for holdingthe drills, consisting of a perforated grinding-gage provided with ashank having a V-shaped groove, said shank constructed with a throughslot at right angles to said groove, in connection with a clamp which isadapted to fit within said through-slot, said clamp serving to hold thedrill firmly in place, substantially as set forth.

3. In a device for grinding and sharpening drills, the perforated faceand grooved shank, in combination with means for holding the drill inplace, and also with means to regulate the end and axial adjustment ofthe drill, substantially as set forth.

4. The combination, with a stock consisting of a perforatedgrinding-gage provided with a shank having a V-shaped groove, of acollet adapted to be adjustably secured to the drill and to said shank,substantially as set forth.

5. The combination, with a stock consistin g of a perforatedgrinding-gage provided with a shank having a V-shaped groove and arecessed end, of a collet having two projections arranged diametricallyopposite each other, substantially as set forth. 7

6. The combination, with a stock consisting of a perforatedgrinding-gage provided with a shank having a V-shaped groove and arecessed end, of a collet having two projections, which engage with therecessed end of said shank, said collet also provided with-an adjusting-screw for securing the same to the drill, substantially as setforth.

7. In a device for grinding and sharpening drills, the stock consistingof a grinding-gage and a grooved shank, said face being provided with adiamond or other shaped opening, into which merges the V-groove formedin the shank, substantially as set forth.

In testimony that I claim the foregoing I have hereunto set my hand andseal this 8th day of December, 1877.

ALEXANDER K. RIDER.

'Witnesses:

Gno. W. STODDARD, W. G. RUTHERFORD.

